PHP Warnings generated

I’ve installed ACF and vffa and am experiencing the following warnings;any suggestions?:

Warning: include_once() [function.include-once]: Unable to access /home/waterway/public_html/alrewasplan.co.uk/wp-content/plugins/validated-field-for-acf/../advanced-custom-fields/core/fields/acf_field.php in /home/waterway/public_html/alrewasplan.co.uk/wp-content/plugins/validated-field-for-acf/validated_field.php on line 12

Warning: include_once(/home/waterway/public_html/alrewasplan.co.uk/wp-content/plugins/validated-field-for-acf/../advanced-custom-fields/core/fields/acf_field.php) [function.include-once]: failed to open stream: No such file or directory in /home/waterway/public_html/alrewasplan.co.uk/wp-content/plugins/validated-field-for-acf/validated_field.php on line 12

Warning: include_once() [function.include]: Failed opening ‘/home/waterway/public_html/alrewasplan.co.uk/wp-content/plugins/validated-field-for-acf/../advanced-custom-fields/core/fields/acf_field.php’ for inclusion (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/waterway/public_html/alrewasplan.co.uk/wp-content/plugins/validated-field-for-acf/validated_field.php on line 12

Warning: Cannot modify header information – headers already sent by (output started at /home/waterway/public_html/alrewasplan.co.uk/wp-content/plugins/validated-field-for-acf/validated_field.php:12) in /home/waterway/public_html/alrewasplan.co.uk/wp-includes/pluggable.php on line 875

Warning: Cannot modify header information – headers already sent by (output started at /home/waterway/public_html/alrewasplan.co.uk/wp-content/plugins/validated-field-for-acf/validated_field.php:12) in /home/waterway/public_html/alrewasplan.co.uk/wp-includes/pluggable.php on line 875

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